Help! Chick might be being pecked at?!

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We are fist time chick raisers and came home to find one of our chicks with this on her shoulder area... keeping the bedding clean and dry which is why we suspect pecking. Anyone seen anything like it? Haven't seen any of the other chicks peck at her at all. She does mess with the area a lot though. No other symptoms. We have 5 chicks total.

Thank you! We have them in a large metal horse trough.The girls do seem overall very happy. My husband thinks now that she may have been pooped on and pecked the area away herself. We live in Maine so they should be able to be moved into the coop in another week or so.